body{
    display: flex;
    flex-direction: column;
    header{
        width: 100%;
        line-height: 50px;
        text-align: center;
        background-color: #4294FF ;
        color: #fff;
        font-size: 16px;
        position: relative;
        span{
            position: absolute;
            left: 20px;
            top: 0px;
        }
    }
    main{
        flex: 1;
        overflow-y: scroll;
        padding-bottom: 20px;
        .sub{
            width: 100%;
            height: 55px;
            button{
                width: 80%;
                height: 55px;
                background-color: #4294FF ;
                color: #fff;
                border-radius: 25px;
                margin: 0 auto;
            }
        }
    }
}
    
